psb sounds like hair clippers buzzing

impsick · 5th January 2007, 04:13 PM

ok so im having an issue. im using brians LM3886 boards. i have a 24v-0-24v ct transformer.

i read on a post of someone using a ct transformer and basically said send 24v(A) to AC1, 24v(B) to AC2, and the CT to both. so i did that and the psb seem to power up good. LED lite up, V-,PG- =34vdc, and V+,PG+=34vdc.
problem is once i hook up the amp board and power up the psb vibrates, basically sounds like hair clippers.

ha ha laugh it up. as long as you all find it amusing. jk,
i dont know what the deal is. V-psb to V-, V+psb to V+, &PG+- to corresponding pg's+-.
id appreciate the help if aanyone understood me

impsick · 5th January 2007, 05:29 PM

anybody??? got any idea??
i was messing w/ it and i pulled v- and pg+ and turned the amp on and it didnt buz. is it possible i need to switch v- and pg+ destination? **** i dont know

BrianDonegan · 5th January 2007, 07:42 PM

From PD's 3875 document...

impsick · 6th January 2007, 02:00 AM

brian would this apply to the lm3886 psboard too?

CarlosT · 8th January 2007, 02:27 PM

Quote:

Originally posted by impsick
...is it possible i need to switch v- and pg+ destination? **** i dont know

I wouldn't think that's a good idea...both the diodes and capacitors are polarized on the rectifier board and further downstream on the amp board.

jimbo1968 · 9th January 2007, 11:27 PM

pictures are definitely worth a thousand words when you are hoping for responses

megajocke · 10th January 2007, 08:09 AM

positive and negative rectifier + center tapped transformer = short circuit... Draw it up and you see that the diodes short the transformer during one of the half cycles. If you have a centertapped transformer, connect the center tap to the common after the rectifiers instead.

The picture Brian posted will work, connect it like that if that is the board you have.

5th January 2007, 04:13 PM	#1
impsick diyAudio Member Join Date: Dec 2006	psb sounds like hair clippers buzzing ok so im having an issue. im using brians LM3886 boards. i have a 24v-0-24v ct transformer. i read on a post of someone using a ct transformer and basically said send 24v(A) to AC1, 24v(B) to AC2, and the CT to both. so i did that and the psb seem to power up good. LED lite up, V-,PG- =34vdc, and V+,PG+=34vdc. problem is once i hook up the amp board and power up the psb vibrates, basically sounds like hair clippers. ha ha laugh it up. as long as you all find it amusing. jk, i dont know what the deal is. V-psb to V-, V+psb to V+, &PG+- to corresponding pg's+-. id appreciate the help if aanyone understood me __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

5th January 2007, 05:29 PM	#2
impsick diyAudio Member Join Date: Dec 2006	anybody??? got any idea?? i was messing w/ it and i pulled v- and pg+ and turned the amp on and it didnt buz. is it possible i need to switch v- and pg+ destination? **** i dont know __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

6th January 2007, 02:00 AM	#4
impsick diyAudio Member Join Date: Dec 2006	brian would this apply to the lm3886 psboard too? __________________ "Nothing happens for a reason. There are just reasons why things happen." Quote me on that. http://stores.ebay.com/AudioGrade?_rdc=1

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9th January 2007, 11:27 PM	#6
jimbo1968 diyAudio Member Join Date: Nov 2004 Location: UK, bristol	pictures are definitely worth a thousand words when you are hoping for responses

10th January 2007, 08:09 AM	#7
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	positive and negative rectifier + center tapped transformer = short circuit... Draw it up and you see that the diodes short the transformer during one of the half cycles. If you have a centertapped transformer, connect the center tap to the common after the rectifiers instead. The picture Brian posted will work, connect it like that if that is the board you have.

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